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		<h1 id="0098-more-headerbar-stuff">0098: More HeaderBar Stuff</h1>

<p>Something else you can do with a <code class="language-plaintext highlighter-rouge">HeaderBar</code> is add an extra <code class="language-plaintext highlighter-rouge">Button</code> or three. Why? I’ll leave that to your imagination just as I’ll leave you to ponder why you’d wanna rearrange the contents of a <code class="language-plaintext highlighter-rouge">HeaderBar</code> as will be seen in our second demo today. For now, though, let’s concentrate on getting extra widgets in there. We’ll concern ourselves with rearranging stuff later.</p>

<h2 id="headerbar-button">HeaderBar Button</h2>

<!-- 0, 1 -->
<!-- first occurrence of application and terminal screen shots on a single page -->
<div class="screenshot-frame">
	<div class="frame-header">
		Results of this example:
	</div>
	<div class="frame-screenshot">
		<figure>
			<img id="img0" src="../images/screenshots/001_window/window_17.png" alt="Current example output" />		<!-- img# -->
			
			<!-- Modal for screenshot -->
			<div id="modal0" class="modal">																	<!-- modal# -->
				<span class="close0">&times;</span>															<!-- close# -->
				<img class="modal-content" id="img00" />															<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal0");														// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img0");															// img#
			var modalImg = document.getElementById("img00");													// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close0")[0];											// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>
			<figcaption>
			Current example output
			</figcaption>
		</figure>
	</div>

	<div class="frame-terminal">
		<figure class="right">
			<img id="img1" src="../images/screenshots/001_window/window_17_term.png" alt="Current example terminal output" />		<!-- img#, filename -->

			<!-- Modal for terminal shot -->
			<div id="modal1" class="modal">																				<!-- modal# -->
				<span class="close1">&times;</span>																		<!-- close# -->
				<img class="modal-content" id="img11" />																		<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal1");																	// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img1");																		// img#
			var modalImg = document.getElementById("img11");																// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close1")[0];														// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>

			<figcaption>
				Current example terminal output (click for enlarged view)
			</figcaption>
		</figure>
	</div>

	<div class="frame-footer">																								<!-- ------------- filename (below) --------- -->
		The code file for this example is available <a href="https://github.com/rontarrant/gtkd_demos/blob/master/001_window/window_17_headerbar_extra_button.d" target="_blank">here</a>.
	</div>
</div>
<!-- end of snippet for first (1st) occurrence of application and terminal screen shots on a single page -->

<p>If we build on what we had last time, we can just add a statement to the preamble of our <code class="language-plaintext highlighter-rouge">MyHeaderBar</code> class:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">HeaderBarButton</span> <span class="n">headerBarButton</span><span class="p">;</span>
</code></pre></div></div>

<p>And that gets instantiated and stuffed into our UI with these two statements in our constructor:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">headerBarButton</span> <span class="p">=</span> <span class="k">new</span> <span class="n">HeaderBarButton</span><span class="p">();</span>
<span class="n">packStart</span><span class="p">(</span><span class="n">headerBarButton</span><span class="p">);</span>
</code></pre></div></div>

<p>Take note that unlike <code class="language-plaintext highlighter-rouge">Box.packStart()</code> which takes four arguments, <code class="language-plaintext highlighter-rouge">HeaderBar.packStart()</code> only takes one, a pointer to the extra <code class="language-plaintext highlighter-rouge">Widget</code> you’re stuffing in there.</p>

<p>There’s only one thing left to look at for this demo and that’s the <code class="language-plaintext highlighter-rouge">HeaderBarButton</code> class:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">class</span> <span class="n">HeaderBarButton</span> <span class="p">:</span> <span class="n">Button</span>
<span class="p">{</span>
	<span class="nb">string</span> <span class="n">labelText</span> <span class="p">=</span> <span class="s">"Click Me"</span><span class="p">;</span>
	
	<span class="k">this</span><span class="p">()</span>
	<span class="p">{</span>
		<span class="k">super</span><span class="p">(</span><span class="n">labelText</span><span class="p">);</span>
		
		<span class="n">addOnClicked</span><span class="p">(&amp;</span><span class="n">onClicked</span><span class="p">);</span>
		
	<span class="p">}</span> <span class="c1">// this()</span>
	
	
	<span class="kt">void</span> <span class="n">onClicked</span><span class="p">(</span><span class="n">Button</span> <span class="n">b</span><span class="p">)</span>
	<span class="p">{</span>
		<span class="n">writeln</span><span class="p">(</span><span class="s">"HeaderBar extra button clicked"</span><span class="p">);</span>
		
	<span class="p">}</span> <span class="c1">// onClicked()</span>
	
<span class="p">}</span> <span class="c1">// class HeaderBarButton</span>
</code></pre></div></div>

<p>And as you can see, it’s just an ordinary <code class="language-plaintext highlighter-rouge">Button</code> dressed up for a night at the <code class="language-plaintext highlighter-rouge">HeaderBar</code>.</p>

<p>That gives us a <code class="language-plaintext highlighter-rouge">Button</code> to the left of the <code class="language-plaintext highlighter-rouge">HeaderBar</code>’s title and subtitle. But what if we want the <code class="language-plaintext highlighter-rouge">Button</code> to appear to the right instead?</p>

<h2 id="buttons-to-the-left-of-title-buttons-to-the-right">Buttons to the Left of Title, Buttons to the Right</h2>

<!-- 2, 3 -->
<!-- second occurrence of application and terminal screen shots on a single page -->
<div class="screenshot-frame">
	<div class="frame-header">
		Results of this example:
	</div>
	<div class="frame-screenshot">
		<figure>
			<img id="img2" src="../images/screenshots/001_window/window_18.png" alt="Current example output" />		<!-- img# -->
			
			<!-- Modal for screenshot -->
			<div id="modal2" class="modal">																<!-- modal# -->
				<span class="close2">&times;</span>														<!-- close# -->
				<img class="modal-content" id="img22" />														<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal2");													// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img2");														// img#
			var modalImg = document.getElementById("img22");												// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close2")[0];										// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>
			<figcaption>
			Current example output
			</figcaption>
		</figure>
	</div>

	<div class="frame-terminal">
		<figure class="right">
			<img id="img3" src="../images/screenshots/001_window/window_18_term.png" alt="Current example terminal output" /> 		<!-- img#, filename -->

			<!-- Modal for terminal shot -->
			<div id="modal3" class="modal">																			<!-- modal# -->
				<span class="close3">&times;</span>																	<!-- close# -->
				<img class="modal-content" id="img33" />																	<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal3");																// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img3");																	// img#
			var modalImg = document.getElementById("img33");															// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close3")[0];													// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>

			<figcaption>
				Current example terminal output (click for enlarged view)
			</figcaption>
		</figure>
	</div>

	<div class="frame-footer">																							<!--------- filename (below) ------------>
		The code file for this example is available <a href="https://github.com/rontarrant/gtkd_demos/blob/master/001_window/window_18_headerbar_start_end_buttons.d" target="_blank">here</a>.
	</div>
</div>
<!-- end of snippet for second (2nd) occurrence of application and terminal screen shots on a single page -->

<p>So, if <code class="language-plaintext highlighter-rouge">packStart()</code> will place a Button to the left of the <code class="language-plaintext highlighter-rouge">HeaderBar</code>’s title, what do you suppose <code class="language-plaintext highlighter-rouge">packEnd()</code> does?</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">headerBarButtonRight</span> <span class="p">=</span> <span class="k">new</span> <span class="n">HeaderBarButton</span><span class="p">(</span><span class="n">rightLabel</span><span class="p">);</span>
<span class="n">packEnd</span><span class="p">(</span><span class="n">headerBarButtonRight</span><span class="p">);</span>
</code></pre></div></div>

<p>Yup, it sticks the <code class="language-plaintext highlighter-rouge">Button</code> <em>after</em> the Title/subtitle. And there’s nothing really exciting about that, but we’ve got a whole demo dedicated to it anyway.</p>

<p>Oh. And like <code class="language-plaintext highlighter-rouge">HeaderBar.packStart()</code>, <code class="language-plaintext highlighter-rouge">HeaderBar.packEnd()</code> only takes one argument.</p>

<p>But what if we need to have our standard <code class="language-plaintext highlighter-rouge">Button</code>s move around under user control? Well, that’s covered, too… perhaps by accident, but maybe by design. Let’s have a look…</p>

<h2 id="dynamic-headerbar-layout">Dynamic HeaderBar Layout</h2>

<!-- 4, 5 -->
<!-- third occurrence of application and terminal screen shots on a single page -->
<div class="screenshot-frame">
	<div class="frame-header">
		Results of this example:
	</div>
	<div class="frame-screenshot">
		<figure>
			<img id="img4" src="../images/screenshots/001_window/window_19.png" alt="Current example output" />		<!-- img# -->
			
			<!-- Modal for screenshot -->
			<div id="modal4" class="modal">																<!-- modal# -->
				<span class="close4">&times;</span>														<!-- close# -->
				<img class="modal-content" id="img44" />														<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal4");													// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img4");														// img#
			var modalImg = document.getElementById("img44");												// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close4")[0];										// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>
			<figcaption>
			Current example output
			</figcaption>
		</figure>
	</div>

	<div class="frame-terminal">
		<figure class="right">
			<img id="img5" src="../images/screenshots/001_window/window_19_term.png" alt="Current example terminal output" /> 		<!-- img#, filename -->

			<!-- Modal for terminal shot -->
			<div id="modal5" class="modal">																			<!-- modal# -->
				<span class="close5">&times;</span>																	<!-- close# -->
				<img class="modal-content" id="img55" />																	<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal5");																// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img5");																	// img#
			var modalImg = document.getElementById("img55");															// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close5")[0];													// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>

			<figcaption>
				Current example terminal output (click for enlarged view)
			</figcaption>
		</figure>
	</div>

	<div class="frame-footer">																							<!---------- filename (below) ---------->
		The code file for this example is available <a href="https://github.com/rontarrant/gtkd_demos/blob/master/001_window/window_19_headerbar_dynamic_layout.d" target="_blank">here</a>.
	</div>
</div>
<!-- end of snippet for third (3rd) occurrence of application and terminal screen shots on a single page -->

<p>We won’t need to change any of the preamble or constructor code for this, just add a bit of functionality to our <code class="language-plaintext highlighter-rouge">Button</code>(s) like this:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">class</span> <span class="n">HeaderBarButton</span> <span class="p">:</span> <span class="n">Button</span>
<span class="p">{</span>
	<span class="nb">string</span> <span class="n">rightClose</span> <span class="p">=</span> <span class="s">"minimize,maximize,icon:close"</span><span class="p">;</span>
	<span class="nb">string</span> <span class="n">leftClose</span> <span class="p">=</span> <span class="s">"close:minimize,maximize,icon"</span><span class="p">;</span>
	<span class="n">HeaderBar</span> <span class="n">_headerBar</span><span class="p">;</span>
	
	<span class="k">this</span><span class="p">(</span><span class="nb">string</span> <span class="n">labelText</span><span class="p">,</span> <span class="n">HeaderBar</span> <span class="n">headerBar</span><span class="p">)</span>
	<span class="p">{</span>
		<span class="k">super</span><span class="p">(</span><span class="n">labelText</span><span class="p">);</span>
		
		<span class="n">_headerBar</span> <span class="p">=</span> <span class="n">headerBar</span><span class="p">;</span>
		
		<span class="n">addOnClicked</span><span class="p">(&amp;</span><span class="n">onClicked</span><span class="p">);</span>
		
	<span class="p">}</span> <span class="c1">// this()</span>
	
	
	<span class="kt">void</span> <span class="n">onClicked</span><span class="p">(</span><span class="n">Button</span> <span class="n">b</span><span class="p">)</span>
	<span class="p">{</span>
		<span class="n">writeln</span><span class="p">(</span><span class="s">"HeaderBar extra button clicked"</span><span class="p">);</span>
		
		<span class="k">if</span><span class="p">(</span><span class="n">_headerBar</span><span class="p">.</span><span class="n">getDecorationLayout</span><span class="p">()</span> <span class="p">==</span> <span class="n">rightClose</span><span class="p">)</span>
		<span class="p">{</span>
			<span class="n">_headerBar</span><span class="p">.</span><span class="n">setDecorationLayout</span><span class="p">(</span><span class="n">leftClose</span><span class="p">);</span>
		<span class="p">}</span>
		<span class="k">else</span>
		<span class="p">{</span>
			<span class="n">_headerBar</span><span class="p">.</span><span class="n">setDecorationLayout</span><span class="p">(</span><span class="n">rightClose</span><span class="p">);</span>
		<span class="p">}</span>
		
	<span class="p">}</span> <span class="c1">// onClicked()</span>
	
<span class="p">}</span> <span class="c1">// class HeaderBarButton</span>
</code></pre></div></div>

<p>All we’re doing here is swapping the close, minimize, and maximize buttons from one side to the other. In the preamble, we layout the two button order strings:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">string</span> <span class="n">rightClose</span> <span class="p">=</span> <span class="s">"minimize,maximize,icon:close"</span><span class="p">;</span>
<span class="nb">string</span> <span class="n">leftClose</span> <span class="p">=</span> <span class="s">"close:minimize,maximize,icon"</span><span class="p">;</span>
</code></pre></div></div>

<p>And then in the <code class="language-plaintext highlighter-rouge">onClicked()</code> function, we check to see which one is in use and substitute the other.</p>

<p>A demo like this may seem a bit silly at first glance, but the implications—when added together with <code class="language-plaintext highlighter-rouge">packStart()</code> and <code class="language-plaintext highlighter-rouge">packEnd()</code>—can open up possibilities in UI hinting. Coupled with changes in <code class="language-plaintext highlighter-rouge">HeaderBar</code> text and/or background color, these elements can help orient the user to changes in configuration or status for whatever’s going on within a <code class="language-plaintext highlighter-rouge">Window</code>.</p>

<p>And just to round things out, let’s take a quick look at one more thing we can do with a <code class="language-plaintext highlighter-rouge">HeaderBar</code>, something you’ve likely guessed can be done, but let’s look at the proof…</p>

<h2 id="an-image-in-a-headerbar">An Image in a HeaderBar</h2>

<!-- 6, 7 -->
<!-- third occurrence of application and terminal screen shots on a single page -->
<div class="screenshot-frame">
	<div class="frame-header">
		Results of this example:
	</div>
	<div class="frame-screenshot">
		<figure>
			<img id="img6" src="../images/screenshots/001_window/window_20.png" alt="Current example output" />		<!-- img# -->
			
			<!-- Modal for screenshot -->
			<div id="modal6" class="modal">																<!-- modal# -->
				<span class="close6">&times;</span>														<!-- close# -->
				<img class="modal-content" id="img66" />														<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal6");													// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img6");														// img#
			var modalImg = document.getElementById("img66");												// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close6")[0];										// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>
			<figcaption>
			Current example output
			</figcaption>
		</figure>
	</div>

	<div class="frame-terminal">
		<figure class="right">
			<img id="img7" src="../images/screenshots/001_window/window_20_term.png" alt="Current example terminal output" /> 		<!-- img#, filename -->

			<!-- Modal for terminal shot -->
			<div id="modal7" class="modal">																			<!-- modal# -->
				<span class="close7">&times;</span>																	<!-- close# -->
				<img class="modal-content" id="img77" />																	<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal7");																// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img7");																	// img#
			var modalImg = document.getElementById("img77");															// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close7")[0];													// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>

			<figcaption>
				Current example terminal output (click for enlarged view)
			</figcaption>
		</figure>
	</div>

	<div class="frame-footer">																							<!---------- filename (below) ---------->
		The code file for this example is available <a href="https://github.com/rontarrant/gtkd_demos/blob/master/001_window/window_20_headerbar_image.d" target="_blank">here</a>.
	</div>
</div>
<!-- end of snippet for fourth (4th) occurrence of application and terminal screen shots on a single page -->

<p>As mentioned earlier in this series, we aren’t restricted to using Button widgets in a <code class="language-plaintext highlighter-rouge">HeaderBar</code>, so why not an <code class="language-plaintext highlighter-rouge">Image</code>? It’s simpler than placing an image in a <code class="language-plaintext highlighter-rouge">DrawingArea</code>, in fact. All we have to do is add these lines to the constructor:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">headerBarImage</span> <span class="p">=</span> <span class="k">new</span> <span class="n">Image</span><span class="p">(</span><span class="n">imageName</span><span class="p">);</span>
<span class="n">packStart</span><span class="p">(</span><span class="n">headerBarImage</span><span class="p">);</span>
</code></pre></div></div>

<p>And don’t forget to do this at the top of your code:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">import</span> <span class="n">gtk</span><span class="p">.</span><span class="n">Image</span><span class="p">;</span>
</code></pre></div></div>

<p>And add this to the HeaderBar preamble:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">Image</span> <span class="n">headerBarImage</span><span class="p">;</span>
</code></pre></div></div>

<h2 id="conclusion">Conclusion</h2>

<p>And that should give you an idea of how flexible the <code class="language-plaintext highlighter-rouge">HeaderBar</code> can be. When we come back to this topic, we’ll look at how they work with a <code class="language-plaintext highlighter-rouge">Dialog</code>. Until then, happy coding.</p>

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